Furnace



(No Model.)

S. J. ES.

FUR E.

No. 426,038. v PatentedApr. 22, 1890.

UNITED STATES PATENT OFFICE.

SAMUEL J. MILES, OF CHICAGO, ILLINOIS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 426,038, dated April 22, 1890.

Application filed December 10, 1889. Serial No. 333,254- (No model.)

To all whom it may concern.-

Be it known that I, SAMUEL J. MILES, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented a certain new and useful Im= proveinent in Furnaces, of which the following is a full, clear, and exact specification.

My invention relates to furnaces, specially such as are designed for burning fine fuel, and relates particularly to the fire-box, grates, and devices for supplying air,

My invention is illustrated in the accompanying drawings, wherein- Figure l is a longitudinal vertical section. Fig. 2 is a vertical crosssection.

Like parts are indicated by the same letter in both the figures.

A is the bed or ground on which the box stands; B, the walls of the furnace; O, the bridge-wall; D, a blast-fan from which leads the pipe E, from which lead the branches F F, running, respectively, to the supply-pipes G G. From these supply-pipes rises at the extremity of each a pipe J J, which pipes are connected across the ends of the firebox and below the grate-bars by the transverse pipes K K. Into these pipes are screw-threaded the longitudinally-arranged upwardly-perforated discharge-pipes L L.

M is an interior practically air-tight lining for said. fire-box or for the lower portion thereof, usually called the aslnpit. Longitudinally traversing said fire-box at the upper part of the ash-pit are the curtains N N,

provided with the ledges O O, on which restthe perforated grate-bars P I, as also on similar side ledges R R. These grate-bars are made in sections and provided with long slots S S.

T T are the inclined sides of the aslnpit, terminating at the perforated bottoms U U, which are provided with the longitudinallyreciprocating perforated slides V V. Into the chamber beneath this slide is inserted the WOllll COIlVGYGl IV, having a handle X.

All these parts may of course be greatly varied without departing from the spirit of my invention, which will be seen when the use and operation of the same is described.

The use and operation of my invention are as follows: The time fue1--as, for instance,

hard-coal slack, dust, and the like-is scattered about upon the grate-bars P P, the slots S S being of such size as to prevent the same from passing through, at least in any considerable quantities, and the same having been fired the combustion may be sustained and continued by pulling out the slide V, so as to make its apertures register with the bot tom of the perforated bottom U. Thereupon a natural draft is supplied through such registering apertures up through the slots S S. If nowit is desired to furnish an artificial draft or blast, the slide V is moved, so as to close the apertures and make the two chambers surrounded by the inclined sides F F, the ends M M, the bottom U, and slide V, and the grate-bars P P practically air-tight chambers, save for the openings through such grate-bars If new the blast-fan D be set in operation, a blast would be supplied to the pipe E and pipes F F to the underground pipes or reservoirs G G. Thence the draft is forced through the pipes J J into the transverse pipes K K, and thence into the longitudinal perforated pipes L L. From these pipes it passes out through the apertures and is driven upward against the under side of the grate-bars P P or through the slots S S. Thus the combustion is encouraged and sustained by any desired blast. The curtains N N divide the upper part of the chamber below the grate-bars into sections, through which the pipes L L pass, and thus a current of air is concentrated upon the sections of the grate-bars. The particles which pass through the gratebars will roll down the sides T T and onto the perforated bottom, and thence into the receptacle below the same. This forms a certain quantity of ashes and dust, which is removed in any desired manner or perhaps by the worm-conveyer IV.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. In a furnace, the combination of a series of perforated grates or grate-bars with one or more normally air-tight ash-chambers thereunder and blast-pipes which discharge into such ash-chambers, said ash-chambers having apertures and slides in the bottom and inclined sides.

ries of perforated blast-pipes thereunder and therealong and ash-chambers thereunderprovided with inclined walls, and a perforated to bottom and slide, whereby the ash-chamber may be made air-tight or may be opened to permit its contents to flow out.

SAMUEL J. MILES. Witnesses:

CELESTE CHAPMAN, DAVIDA J. JOHNSON. 

